I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
canon cannon canine conin conine guanin guenon coniine guanine quinone
fanon anon canon onion tenon ronion anion renown cannon pinion none wanion known munnion neon quinone nona guanin nanny ionone noon inion xenon reunion pinon pennon ninon guenon minion noun phonon fanion bunion annona gonion union chinone
canoe can cain cane canna cannie canny scan